Patent GB-299121-A (GB)
Title: An improved vehicle brake mechanism
IPC: F16D65/02
Filed: 1927-08-10
Abstract: 299,121. Clark, D'A. M., (Bendix Brake Co.). Aug. 10, 1927. Disc; compensating for wear; fluid-pressure.- Apparatus of the kind in which frictional non- rotating elements or discs move axially in opposite directions into contact with a rotating braking surface and also have an automatic intensifying effect, are constructed so that the discs interact directly with one another or with an intermediate member so that a limited angular movement imparted to one of the discs causes both to move axially in opposite directions. In the application to a brake for vehicle steering wheels, Fig. 1, the inner and outer walls of a casing 22 secured to the wheel are engaged by frictional facings on discs 14, 18 which are brought into and out of engagement by relative axial movement resulting from limited relative rotary movement. The flanged centre 19 of the disc 18 has a screwed engagement with the flanged centre 15 of the disc 14. The centre 15 is held against rotation by a splined connection 16 to the bracket 13, while the flanged centre 19 is provided with a toothed segment 25 which is engaged by a toothed pinion 26 operated by the jointed shaft 28. The discs 14, 18 may be centred, when disengaged, by a spring 33, Fig. 5, which pulls a pin 31 secured to the disc 14 into engagement with the bracket 13. In a modification, the discs are arranged to grip between them, a central braking member secured in the casing 22. The rack and pinion operating mechanism may be replaced by a lever 35, Fig. 10, and link 37 connected to an arm 36 on the flanged centre 19. In another construction. Fig. 11, a fixed bracket 38 and arm 39 on the centre 19 are connected respectively to a cylinder 40 and piston 41 which are separated by fluid pressure. In the modification shown in Fig. 12, the screwed connection between the flanged centres 15, 19 is replaced by several pairs of tapered cams 45 secured to the discs 14, 18. In a further modification shown in Figs. 18 and 19, a pin 50 on the flanged centre 15 is provided with a bead working in an axial groove 51 on the bracket 13 and with a stem engaging an inclined slot 53 in the other flanged centre 19, which is operated by the lever 54. Adjustment for wear of rack-andpinion operating mechanism may be effected by the construction shown in Fig. 17, in which the operating pinion is splined to the spindle 47 and may be slid clear of the rack 25 against the resistance of the spring 49, and rotated to a new position before re-engagement. The disc members 14, 18 may be coned. Fig. 21 shows two complete brake elements applied to the transmission shaft 57 of a motor vehicle. The shaft carries two rotating members 62, 62<1> each of which rotates between a pair of braking discs provided with circumferential screwed flanges operating as described previously. The two inner screwed flanges are provided with pins 59, 59<1> which are operated from a pull rod 61 through an equalizing lever 60. In the construction shown in Fig. 23, the two discs 14, 18 are mounted by opposite handed screw threads on the bracket 13 and engage a floating brake element 64 held against rotation by the pin 67 in the casing 22. Axial adjustment of the discs is effected as before by a pinion 26 and segment 25, the two discs being made to turn together by inter-engaging teeth 69. In a modification, one disc is fixed to the bracket 13. In another form, the element 64 is fixed to the casing and the discs 14, 18 are mounted by screws on a sleeve splined to the bracket 13. In the construction shown in Fig. 26, the discs engage the walls of the casing 22 and are operated through an equalizing lever 83. The construction shown in Fig. 23 may be modified by fixing one disc 14 to the bracket 13 and splining the other disc 18 to the bracket so as to eliminate rotation, axial movement being imparted to the disc 18 by cam mechanism.